The reverse also is true-understanding the mechanisms underlying song learning provides insight into how song has evolved as a communication signal. Song has two primary functions: to repel other males from a defended space and to attract females and stimulate their courtship.
Explanation:
go ahead give it to the person below
Answer:
your welcome
Explanation:
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Internal- genetic factors, addictive tendencies, the need to feel pleasure
External - celebrity role models and perception of drug use as a norm